Infiniti Q45 (FY33). Manual - part 95

SBR813DA

Diagnostic Procedure 12 (Control unit)

Code No. 71 of ABS/TCS control unit

1. Disconnect ABS/TCS control unit con-

nectors.
Check terminals for damage or loose
connections. Then reconnect connec-
tors.

2. Carry out self-diagnosis again.

Do ABS warning lamp and TCS OFF
indicator activate again?

Yes

E

No

Inspection end

CONTROL UNIT POWER SUPPLY
CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Check voltage. Refer to

in Diagnostic

Procedure 11, BR-96.

Does SLIP indicator indicate code No. 71
again?

No

E

Yes

Replace ABS/TCS control
unit.

Inspect the system according to the code
No.

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

H

H

H

BR-97

SBR660D

Diagnostic Procedure 13 (Power supply and
ground circuit for TAC module)

Code No. 0 ... LED of TAC module does not blink

SBR385E

SBR386E

SBR661D

1. Disconnect TAC module connectors.

Check terminals for damage or loose
connections. Then reconnect connec-
tors.

2. Carry out self-diagnosis again.

Do SLIP indicator and TCS OFF indi-
cator activate again?

Yes

E

No

Inspection end

CONTROL UNIT POWER SUPPLY
CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1. Disconnect TAC module connector.
2. Check voltage between TAC module

connector terminal

q

8

and ground.

Battery voltage should exist.

OK

E

NG

q

A

(See below.)

CONTROL UNIT POWER SUPPLY
CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1. Disconnect TAC module connector.
2. Check voltage between TAC module

connector terminal

q

9

,

q

19

and ground.

Battery voltage should exist when
ignition switch is turned ON.

OK

E

NG

q

B

(Go to next page.)

CONTROL UNIT GROUND CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Check continuity between terminals

q

10

,

q

20

,

107

and ground.

Continuity should exist.

OK

E

NG

Repair harness and con-
nectors.

Check TAC module pin terminals for dam-
age or the connection of TAC module har-
ness connector.
Reconnect TAC module harness connec-
tor. Then retest.

q

A

Check 10A fuse

28

. Refer to POWER

SUPPLY ROUTING in EL section.

OK

E

NG

Replace fuse.

q

C

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

H

H

H

H

H

H

BR-98

q

C

Check continuity between fuse 10A

28

and TAC module connector terminal

q

8

.

Continuity should exist.

OK

E

NG

Check the following.

I

Harness connector

F75

I

Harness for open or
short between TAC mod-
ule and fuse

If NG, repair harness or
connectors.

Check battery. Refer to BATTERY in EL
section.

q

B

Check 10A fuse

30

. Refer to POWER

SUPPLY ROUTING in EL section.

OK

E

NG

Replace fuse.

Check continuity between fuse 10A

30

and TAC module connector terminals

q

9

,

q

19

.

Continuity should exist.

OK

E

NG

Check the following.

I

Harness connector

F75

I

Harness for open or
short between TAC mod-
ule and fuse

If NG, repair harness or
connectors.

Check battery. Refer to BATTERY in EL
section.

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

Diagnostic Procedure 13 (Power supply and
ground circuit for TAC module) (Cont’d)

H

H

H

H

H

BR-99

SBR040EA

Diagnostic Procedure 14 (THROTTLE POSI
SEN: Throttle position sensor signal input
circuit)

Code No. 11 of TAC module

SBR545CA

SBR041EA

SBR387E

1. Disconnect TAC module connectors.

Check terminals for damage or loose
connections. Then reconnect connec-
tors.

2. Carry out self-diagnosis again.

Do SLIP indicator and TCS OFF indi-
cator activate again?

Yes

E

No

Inspection end

Perform self-diagnostic procedure for
ECM.
Does ECM display code No. P0120?

No

E

Yes

Check ECM.
Refer to EC section,
“TROUBLE DIAGNOSES”.

THROTTLE POSITION SENSOR SIGNAL
INPUT CIRCUIT

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

I

Check continuity between terminal

q

2

for TAC module and terminal

q

61

for

ECM.
Continuity should exist.

OK

E

NG

Repair harness and con-
nectors.

I

Check continuity between terminal

q

2

for TAC module and ground.
Continuity should not exist.

OK

E

NG

Repair harness and con-
nectors.

Check continuity between terminal

q

1

for

TAC module and terminal

129

for ECM.

Continuity should exist.

OK

E

NG

Repair harness and con-
nector.

Turn ignition switch to “ON”.
Check voltage between terminal

q

2

and

terminal

q

1

for TAC module.

0.3V to 3.3V should exist depending on
accelerator position.

OK

E

NG

Replace ECM.

Check TAC module pin terminals for dam-
age or the connection of the control unit
harness connector.
Reconnect TAC module harness connec-
tor. Then retest.

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

H

H

H

H

H

H

BR-100